Article Photos: Feds to probe why alarms failed in W.Va. explosion



  Workers look over the area damaged after a gas line exploded near interstate 77 in Sissonville, W.Va., Wednesday Dec. 12, 2012. Tuesday a 20-inch Columbia Gas transmission line exploded, destroying four homes and cooking a section of Interstate 77, a major north-south commuting corridor that passes through the capital city of Charleston, W.V. (AP Photo/Charleston Gazette, Larry Pierce)

Workers look over the area damaged after a gas line exploded near interstate 77 in Sissonville, W.Va., Wednesday Dec. 12, 2012. Tuesday a 20-inch Columbia Gas transmission line exploded, destroying four homes and cooking a section of Interstate 77, a major north-south commuting corridor that passes through the capital city of Charleston, W.V. (AP Photo/Charleston Gazette, Larry Pierce)